JP2591142Y2 - Operation monitoring device for plasma torch - Google Patents
Operation monitoring device for plasma torchInfo
- Publication number
- JP2591142Y2 JP2591142Y2 JP1993031300U JP3130093U JP2591142Y2 JP 2591142 Y2 JP2591142 Y2 JP 2591142Y2 JP 1993031300 U JP1993031300 U JP 1993031300U JP 3130093 U JP3130093 U JP 3130093U JP 2591142 Y2 JP2591142 Y2 JP 2591142Y2
- Authority
- JP
- Japan
- Prior art keywords
- plasma torch
- voltage
- signal
- plasma
- monitoring device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Incineration Of Waste (AREA)
- Discharge Heating (AREA)
- Furnace Details (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、都市ゴミ焼却灰やプラ
スチック・シュレッダーダストなどといった各種産業廃
棄物を熱プラズマによって連続的に、又は、間欠的に溶
融固化したり、金属を溶解したりするための溶融炉に設
けられるプラズマトーチの運転監視装置に関する。The present invention is to continuously or intermittently melt and solidify various industrial wastes such as municipal waste incineration ash and plastic / shredder dust by thermal plasma, or to melt metals. For monitoring the operation of a plasma torch provided in a melting furnace for the purpose.
【０００２】[0002]
【従来の技術】初めに、プラズマトーチの構造を説明す
る。図７は、プラズマトーチの断面図で、５１は陽極、
５２は陰極、５３は水冷用ジャケット、５４はプラズマ
アーク、５５はプラズマガス注入口である。プラズマト
ーチは電極の接続の仕方によって、二種の運転モードが
ある。図７（ａ）に示すように、トーチ内部に陽極５
１、トーチ外筒を陰極５２とするノントランスファモー
ドと、図７（ｂ）に示すように、トーチ内部を陽極５
１、トーチではなく設備側に陰極を接続するトランスフ
ァモードである。尚、プラズマガス注入口５５には、図
示されていないプラズマガス供給装置が接続される。2. Description of the Related Art First, the structure of a plasma torch will be described. FIG. 7 is a cross-sectional view of a plasma torch, where 51 is an anode,
52 is a cathode, 53 is a water cooling jacket, 54 is a plasma arc, and 55 is a plasma gas inlet. The plasma torch has two operation modes depending on how the electrodes are connected. As shown in FIG. 7A, the anode 5 is placed inside the torch.
1. A non-transfer mode in which the outer cylinder of the torch is used as the cathode 52, and the inside of the torch is connected to the anode 5 as shown in FIG.
1. Transfer mode in which the cathode is connected to the equipment instead of the torch. Incidentally, a plasma gas supply device (not shown) is connected to the plasma gas inlet 55.
【０００３】プラズマの発生の仕方としては、前者では
高温のプラズマアークが陽極と陰極のそれぞれに付着す
るのに対して、後者はプラズマトーチ側では陽極のみに
付着し、陰極側の付着は設備側になる。熱プラズマは、
温度が３，０００〜１０，０００Ｋの解離したガス体で
ある。そのため、プラズマトーチに熱損傷が起こる。熱
損傷としては、プラズマトーチのプラズマアークが付着
するポイントが最も激しく、その次にプラズマアーク近
傍である。従って、プラズマを発生させるプラズマトー
チは、主に陽極の熱損傷防止の観点から、水冷用のジャ
ケット５３を有する多重管構造となっている。In the former method, a high-temperature plasma arc adheres to each of an anode and a cathode in the former, whereas the latter adheres only to the anode on the plasma torch side, and adheres to the equipment side on the cathode side. become. Thermal plasma is
It is a dissociated gas at a temperature of 3,000 to 10,000K. Therefore, thermal damage occurs to the plasma torch. Regarding the thermal damage, the point where the plasma arc of the plasma torch adheres is the most severe, followed by the vicinity of the plasma arc. Therefore, the plasma torch for generating plasma has a multi-tube structure having a water cooling jacket 53 mainly from the viewpoint of preventing thermal damage to the anode.
【０００４】しかし、水冷されていると言ってもプラズ
マアークが発生する電極表面は非常な高温に曝されてい
るため、運転中徐々に侵食される。そして、寿命に達し
たところで陽極、若しくはトーチ先端部へのピンホール
の発生、最悪の場合にはトーチが破断し、多量の冷却水
が炉内へ噴出し、水蒸気爆発などの災害を招く。そこ
で、従来は運転毎にプラズマトーチの先端を目視により
観察し、偏減りや異常、またプラズマトーチからの冷却
水漏れを調べていた。[0004] However, even if it is water-cooled, the electrode surface on which a plasma arc is generated is exposed to a very high temperature and is gradually eroded during operation. Then, at the end of the service life, pinholes occur at the anode or at the tip of the torch, and in the worst case, the torch is broken, and a large amount of cooling water is blown into the furnace, causing disasters such as steam explosions. Therefore, conventionally, the tip of the plasma torch has been visually observed for each operation to check for unevenness, abnormalities, and leakage of cooling water from the plasma torch.
【０００５】[0005]
【考案が解決しようとする課題】しかしながら、実際に
は事前の目視による判断は困難であり、更に運転中には
冷却水漏れを的確に検出できずに運転を続行してしまう
という問題点を有している。プラズマトーチの劣化によ
る冷却水漏れに気がつかずに炉を運転し続けること、多
量の冷却水が炉内へ噴出して水蒸気爆発などの災害を招
く。[Problems to be Solved by the Invention] However, in practice, it is difficult to make a visual judgment in advance, and furthermore, during operation, there is a problem that the cooling water leakage cannot be accurately detected and the operation is continued. doing. Continued operation of the furnace without noticing the leakage of cooling water due to the deterioration of the plasma torch causes a large amount of cooling water to squirt into the furnace, causing disaster such as steam explosion.
【０００６】本考案は、従来の技術の有するこのような
問題点に鑑みてなされたものであり、その目的とすると
ころは、運転中に起こるプラズマトーチの異常を即時に
発見し、知らせるプラズマトーチの運転監視装置を提供
しようとするものである。The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to immediately detect and inform a plasma torch abnormality occurring during operation. An operation monitoring device is provided.
【０００７】[0007]
【課題を解決するための手段】上記目的を解決するため
に、本考案のプラズマトーチの運転監視装置は、被溶融
物を溶融するための熱源として溶融炉に設けられ、水冷
用のジャケットを有してプラズマガスが供給されるプラ
ズマトーチの運転監視装置であって、前記炉内圧力の変
動を又は前記プラズマガスの供給圧の変動を検出する圧
力センサと、該圧力センサからの信号波形を所定周波数
帯域でスペクトル積分する積分手段と、該積分手段から
の積分値を所定の積分基準値と比較して大きいと異常信
号を発する積分比較手段と、プラズマトーチの電源電圧
の変動を検出する電圧センサと、該電圧センサの電圧信
号を所定の電圧基準値と比較して電源の電圧降下を検出
する電圧比較手段と、該電圧比較手段からの電圧降下信
号と前記積分比較手段からの異常信号を受けた時に、プ
ラズマトーチの運転を停止させる信号を発する判断手段
とを備え、前記積分基準値が、プラズマトーチからのガ
ス流量によって変化するものである。In order to solve the above-mentioned object, a plasma torch operation monitoring device of the present invention is provided in a melting furnace as a heat source for melting a material to be melted, and has a water cooling jacket. A plasma torch operation monitoring device to which a plasma gas is supplied, wherein a pressure sensor for detecting a fluctuation in the furnace pressure or a fluctuation in a supply pressure of the plasma gas, and a signal waveform from the pressure sensor being determined by a predetermined method. Integrating means for performing spectrum integration in a frequency band, integrating and comparing means for generating an abnormal signal when an integrated value from the integrating means is larger than a predetermined integration reference value, and a voltage sensor for detecting a change in a power supply voltage of the plasma torch Voltage comparing means for comparing a voltage signal of the voltage sensor with a predetermined voltage reference value to detect a voltage drop of the power supply; and a voltage drop signal from the voltage comparing means and the integral comparison. When receiving the abnormal signal from the stage, and a determination means for issuing a signal for stopping the operation of the plasma torch, the integral reference value is one that changes by the gas flow from the plasma torch.
【０００８】[0008]
【作用】プラズマトーチからの冷却水漏れによる炉内圧
力の変動、又はプラズマガスの供給圧の変動を圧力セン
サが検出し、プラズマトーチの電源電圧の変動を電圧セ
ンサが検出し、積分手段が前記圧力センサからの信号波
形を所定周波数帯域でスペクトル積分し、その積分値を
積分比較手段が所定の積分基準値と比較して大きい場合
に異常信号を発し、電圧比較手段が前記電圧センサから
の電圧信号を所定の電圧基準値と比較して電源の電圧降
下を検出し、判断手段が前記電圧比較手段からの電圧降
下信号と前記積分比較手段からの異常信号を受けると、
プラズマトーチの運転を停止させる信号を発して、運転
中に起こるプラズマトーチの異常を即時に発見し知らせ
る。The pressure sensor detects fluctuations in the furnace pressure due to leakage of cooling water from the plasma torch, or fluctuations in the supply pressure of the plasma gas, and the voltage sensor detects fluctuations in the power supply voltage of the plasma torch. The signal waveform from the pressure sensor is spectrally integrated in a predetermined frequency band, and when the integrated value is larger than the predetermined integration reference value, an abnormal signal is issued, and the voltage comparing means outputs the voltage from the voltage sensor. The signal is compared with a predetermined voltage reference value to detect a voltage drop of the power supply, and when the determination unit receives a voltage drop signal from the voltage comparison unit and an abnormal signal from the integration comparison unit,
By issuing a signal to stop the operation of the plasma torch, an abnormality of the plasma torch occurring during the operation is immediately detected and notified.
【０００９】[0009]
【実施例】以下、本考案の実施例を図面を参照しつつ説
明する。図１は本考案実施のプラズマトーチの運転監視
装置を示す図である。図１において、１は溶融炉、２は
プラズマトーチ、３はプラズマトーチの電源装置、４は
圧力センサ、５は電圧センサ、６は積分手段、７は積分
比較手段、８は電圧比較手段、９は判断手段である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a plasma torch operation monitoring device according to the present invention. In FIG. 1, 1 is a melting furnace, 2 is a plasma torch, 3 is a power device for a plasma torch, 4 is a pressure sensor, 5 is a voltage sensor, 6 is integrating means, 7 is integrating comparing means, 8 is voltage comparing means, 9 Is a judgment means.
【００１０】ここで、簡単に図１に示されている溶融炉
１を説明する。溶融炉１は耐火物構造となっており、被
溶融物が供給口１２から炉床へ投下され、プラズマトー
チ２により熱せられて溶融する。溶融してオーバーフロ
ーした溶融物が排出口１３から排出し冷却固化して、搬
出装置１４によって炉外へ搬出される。炉内圧力は供給
された被溶融物の噴出を防ぐために、排気口１５に設け
られた吸気ファンにより負圧状態にされている。Here, the melting furnace 1 shown in FIG. 1 will be briefly described. The melting furnace 1 has a refractory structure, and a material to be melted is dropped from a supply port 12 to a hearth, and is heated and melted by a plasma torch 2. The molten material that has melted and overflowed is discharged from the discharge port 13, solidified by cooling, and carried out of the furnace by the carry-out device 14. The furnace pressure is set to a negative pressure state by an intake fan provided at the exhaust port 15 in order to prevent the supplied melted material from being ejected.
【００１１】本考案のプラズマトーチの運転監視装置
は、溶融炉１の炉壁に設けられる圧力センサ４と、プラ
ズマトーチの電源装置３内に設けられる電圧センサ５
と、そして、溶融炉操作制御ボックス１１等に設けられ
る積分手段６・積分比較手段７・電圧比較手段８・判断
手段９とからなる。The operation monitoring device of the plasma torch of the present invention includes a pressure sensor 4 provided on the furnace wall of the melting furnace 1 and a voltage sensor 5 provided in the power supply device 3 of the plasma torch.
And integrating means 6, integral comparing means 7, voltage comparing means 8, and judging means 9 provided in the melting furnace operation control box 11 and the like.
【００１２】圧力センサ４は、プラズマトーチからの冷
却水漏れによる炉内の圧力変動を検出するためのもの
で、圧力信号波形を積分手段６に送る。圧力センサ４か
らの圧力信号波形は図２に示すようなものである。図２
（ａ）は安定運転中の信号波形で、図２（ｂ）はプラズ
マトーチからの冷却水漏れが起こり、信号波形が乱れて
いる状態である。The pressure sensor 4 is for detecting pressure fluctuation in the furnace due to leakage of cooling water from the plasma torch, and sends a pressure signal waveform to the integrating means 6. The waveform of the pressure signal from the pressure sensor 4 is as shown in FIG. FIG.
FIG. 2A shows a signal waveform during a stable operation, and FIG. 2B shows a state in which a leakage of cooling water from the plasma torch occurs and the signal waveform is disturbed.
【００１３】積分手段６は、前記圧力センサ４からの圧
力の信号波形をバンドフィルタ６ａを通して所定の周波
数帯域を抽出し、その周波数帯域でのパワースペクトル
積分（以下スペクトル積分という。）を行い、その積分
値を積分比較手段７へ送るものである。ここで、所定の
周波数帯域を抽出してスペクトル積分を行う理由は、図
３に示すように、プラズマトーチからの冷却水漏れによ
る信号波形の乱れは、安定運転中の信号波形の周波数領
域とは別の領域に現れるからである。図３（ａ）は安定
運転中の信号波形の周波数領域で、図２（ｂ）はプラズ
マトーチからの冷却水漏れが起こり、信号波形が乱れて
いる状態の周波数領域である。The integrator 6 extracts a predetermined frequency band from the pressure signal waveform from the pressure sensor 4 through a band filter 6a, and performs power spectrum integration (hereinafter referred to as "spectral integration") in the frequency band. The integration value is sent to the integration comparison means 7. Here, the reason for performing the spectrum integration by extracting a predetermined frequency band is that, as shown in FIG. 3, the disturbance of the signal waveform due to the leakage of the cooling water from the plasma torch is different from the frequency region of the signal waveform during the stable operation. This is because it appears in another area. FIG. 3A is a frequency range of a signal waveform during a stable operation, and FIG. 2B is a frequency range of a state where a leakage of cooling water from a plasma torch occurs and the signal waveform is disturbed.
【００１４】積分比較手段７は、図４に示すように、前
記積分手段６で積分された積分値と所定の積分基準値と
比較して大きい場合に判断手段９に異常信号を発するも
のである。所定の積分基準値とは、プラズマトーチから
の冷却水漏れによる信号波形の乱れが現れる周波数領域
での安定運転中のスペクトル積分の値である。As shown in FIG. 4, the integral comparing means 7 issues an abnormal signal to the judging means 9 when the integral value integrated by the integrating means 6 is larger than a predetermined integral reference value. . The predetermined integration reference value is a value of a spectrum integration during a stable operation in a frequency region where disturbance of a signal waveform due to cooling water leakage from the plasma torch appears.
【００１５】又、スペクトル積分値は、図５に示すよう
に、プラズマトーチのプラズマガスの流量によって異な
るので、上記所定の積分基準値は、プラズマガスの流量
に合わせて、図５中の鎖線の如く変化して設定される。Further, as shown in FIG. 5, the spectrum integration value varies depending on the flow rate of the plasma gas from the plasma torch. Therefore, the above-mentioned predetermined integration reference value is set in accordance with the flow rate of the plasma gas. It is set by changing as follows.
【００１６】電圧センサ５は、プラズマトーチの電源電
圧の変動を検出するためのもので、電圧比較手段８は、
前記電圧センサの電圧信号を所定の電圧基準値と比較し
て電源の電圧降下を検出し、判断手段９に電圧降下信号
を送るものである。これは、プラズマトーチからの冷却
水漏れが発生するとプラズマトーチの電源電圧が降下す
ることに着目して、プラズマトーチの異常を前記積分比
較手段７からの異常信号と共に確実にプラズマトーチの
異常を検出してプラズマトーチの運転監視装置の誤作動
を防止する。The voltage sensor 5 is for detecting a fluctuation in the power supply voltage of the plasma torch.
The voltage signal of the voltage sensor is compared with a predetermined voltage reference value to detect a voltage drop of the power supply, and a voltage drop signal is sent to the judging means 9. Focusing on the fact that when the cooling water leaks from the plasma torch, the power supply voltage of the plasma torch drops, the abnormality of the plasma torch is reliably detected together with the abnormality signal from the integration and comparison means 7. To prevent malfunction of the operation monitoring device of the plasma torch.
【００１７】判断手段９は、前記電圧比較手段８と前記
積分比較手段７からの信号により、適切な判断をして、
非常停止信号をプラズマトーチ電源装置３等に送った
り、警報信号を警報ランプ１０等に送ったりする。判断
手段９の判断を表１に示す。前記積分比較手段７からの
信号が異常信号で、且つ、前記電圧比較手段８が電圧降
下信号である場合には、冷却水が多量に炉内に漏れ非常
に危険な状態にあるので、非常停止信号を図１に示すプ
ラズマトーチ電源装置３に送り、プラズマトーチ２の運
転を直ちに停止させる。前記積分比較手段７からの信号
が異常信号で、前記電圧比較手段８からの電圧降下信号
でない場合には、冷却水漏れが疑わしい状態で、警報信
号を警報ランプ１０等に送り、作業員の注意を促す。前
記積分比較手段７からも異常信号が無く、前記電圧比較
手段８からも電圧降下信号がない場合には、そのままプ
ラズマトーチ２の運転を続行する。The judging means 9 makes an appropriate judgment based on the signals from the voltage comparing means 8 and the integrating comparing means 7,
An emergency stop signal is sent to the plasma torch power supply 3 or the like, and an alarm signal is sent to the alarm lamp 10 or the like. Table 1 shows the judgment by the judging means 9. If the signal from the integrating and comparing means 7 is an abnormal signal and the voltage comparing means 8 is a voltage drop signal, a large amount of cooling water leaks into the furnace and is in a very dangerous state. A signal is sent to the plasma torch power supply 3 shown in FIG. 1 to immediately stop the operation of the plasma torch 2. If the signal from the integration comparing means 7 is an abnormal signal and not the voltage drop signal from the voltage comparing means 8, an alarm signal is sent to the alarm lamp 10 or the like in a state where cooling water leakage is suspected, and Prompt. If there is no abnormal signal from the integration comparing means 7 and no voltage drop signal from the voltage comparing means 8, the operation of the plasma torch 2 is continued as it is.
【００１８】[0018]
【表１】 [Table 1]
【００１９】このようなプラズマトーチの運転監視装置
は、プラズマトーチ２から冷却水が炉内に漏れると、炉
内圧力の変動を圧力センサ４が、プラズマトーチ２の電
源電圧の変動を電圧センサ５が検出し、積分手段６が前
記圧力センサ４からの信号波形を所定周波数帯域でスペ
クトル積分し、その積分値を積分比較手段７が所定の積
分基準値と比較して大きい場合に異常信号を発し、電圧
比較手段８が前記電圧センサ５からの電圧信号を所定の
電圧基準値と比較して電源の電圧降下を検出し、判断手
段９が前記電圧比較手段８からの電圧降下信号と前記積
分比較手段７からの異常信号を受けると、プラズマトー
チ２の運転を停止させる信号を発して、運転中に起こる
プラズマトーチの異常を即時に検出する。In such a plasma torch operation monitoring device, when cooling water leaks from the plasma torch 2 into the furnace, the pressure sensor 4 detects a change in the furnace pressure and a voltage sensor 5 detects a change in the power supply voltage of the plasma torch 2. Is detected, the integrating means 6 performs spectrum integration of the signal waveform from the pressure sensor 4 in a predetermined frequency band, and the integration comparing means 7 compares the integrated value with a predetermined integration reference value, and generates an abnormal signal when it is larger. The voltage comparing means 8 compares the voltage signal from the voltage sensor 5 with a predetermined voltage reference value to detect a voltage drop of the power supply, and the judging means 9 compares the voltage drop signal from the voltage comparing means 8 with the integral comparison. Upon receiving the abnormal signal from the means 7, a signal for stopping the operation of the plasma torch 2 is issued, and the abnormality of the plasma torch occurring during the operation is immediately detected.
【００２０】次に、本考案実施の他のプラズマトーチの
運転監視装置を図６により説明する。プラズマトーチ
は、図７に示すように、電極が中空円筒構造であるの
で、この中空部分５６の圧力も炉内に冷却水が漏れる
と、水蒸気により上昇し変動する。このプラズマトーチ
内の圧力変動はプラズマガス供給圧の変動により検出す
ることができる。そこで、プラズマトーチからの冷却水
漏れによる異常を、図１に示す実施例の如く炉内圧力の
変動により検出するのではなく、プラズマガス供給圧の
変動により検出しようとするのが、図６に示す本考案実
施の他のプラズマトーチの運転監視装置である。Next, another operation monitoring device of the plasma torch according to the present invention will be described with reference to FIG. Since the electrode of the plasma torch has a hollow cylindrical structure as shown in FIG. 7, when the cooling water leaks into the furnace, the pressure in the hollow portion 56 also rises and fluctuates due to water vapor. The pressure fluctuation in the plasma torch can be detected by the fluctuation of the plasma gas supply pressure. Therefore, instead of detecting the abnormality due to the cooling water leakage from the plasma torch by the fluctuation in the furnace pressure as in the embodiment shown in FIG. 1, it is attempted to detect the abnormality by the fluctuation of the plasma gas supply pressure. Fig. 4 shows another operation monitoring device of the plasma torch according to the present invention.
【００２１】従って、この本考案実施の他のプラズマト
ーチの運転監視装置において、図１と異なるところは、
プラズマガスの供給圧を測定する圧力計１７が、プラズ
マガス供給装置１６とプラズマトーチ２との間に接続さ
れている点である。その圧力信号波形は、炉内に冷却水
が漏れによる異常が積分を行う周波数帯や基準値が異な
るだけで、図１に示すプラズマトーチの運転監視装置の
場合と同様のパターンで現れるので、圧力計１７からの
信号波形の処理は、積分を行う周波数帯や基準値のみを
変えて、図１に示すプラズマトーチの運転監視装置と同
様に処理される。そして、判断手段９が前記電圧比較手
段８からの電圧降下信号と前記積分比較手段７からの異
常信号を受けると、プラズマトーチ２の運転を停止させ
る信号を発して、運転中に起こるプラズマトーチの異常
を即時に検出する。Therefore, in the operation monitoring device of another plasma torch according to the present invention, the difference from FIG.
The point is that a pressure gauge 17 for measuring the supply pressure of the plasma gas is connected between the plasma gas supply device 16 and the plasma torch 2. The pressure signal waveform appears in the same pattern as that of the operation monitoring device of the plasma torch shown in FIG. 1 except that the frequency band and the reference value at which the abnormality caused by the leakage of the cooling water into the furnace is integrated are different. The processing of the signal waveform from the total 17 is performed in the same manner as in the operation monitoring device of the plasma torch shown in FIG. 1 by changing only the frequency band in which integration is performed and the reference value. When the judging means 9 receives the voltage drop signal from the voltage comparing means 8 and the abnormal signal from the integrating and comparing means 7, it issues a signal for stopping the operation of the plasma torch 2 and generates the plasma torch during the operation. Detect abnormalities immediately.
【００２２】[0022]
【考案の効果】このようにして、本考案のプラズマトー
チの運転監視装置は、運転中に起こるプラズマトーチの
異常を即時に発見できるので、プラズマトーチの劣化に
よる冷却水漏れに気がつかずに運転し続けることがな
く、多量の冷却水を炉内へ噴出して水蒸気爆発などの災
害を招くこともない。As described above, the plasma torch operation monitoring device of the present invention can immediately detect an abnormality of the plasma torch that occurs during operation, so that the operation can be performed without noticing the cooling water leakage due to the deterioration of the plasma torch. There is no continuation, and a large amount of cooling water is not injected into the furnace to cause a disaster such as a steam explosion.
【図１】本考案のプラズマトーチの運転監視装置を示す
図である。FIG. 1 is a diagram illustrating a plasma torch operation monitoring device according to the present invention.
【図２】圧力信号波形を示すグラフである。FIG. 2 is a graph showing a pressure signal waveform.
【図３】周波数に対してスペクトル分解された圧力信号
波形を示すグラフである。FIG. 3 is a graph showing a pressure signal waveform spectrally resolved with respect to frequency.
【図４】スペクトル積分値による異常状態の判断基準を
示すグラフである。FIG. 4 is a graph showing a criterion for determining an abnormal state based on a spectrum integral value.
【図５】プラズマガス流量に対する積分基準値の設定の
仕方を示すグラフである。FIG. 5 is a graph showing how to set an integration reference value with respect to a plasma gas flow rate.
【図６】本考案の他のプラズマトーチの運転監視装置を
示す図である。FIG. 6 is a diagram illustrating another apparatus for monitoring the operation of a plasma torch according to the present invention;
【図７】プラズマトーチの要部断面図である。FIG. 7 is a sectional view of a main part of the plasma torch.
１ 溶融炉 ２ プラズマトーチ ３ 電源装置 ４ 圧力センサ ５ 電圧センサ ６ 積分手段 ７ 積分比較手段 ８ 電圧比較手段 ９ 判断手段 DESCRIPTION OF SYMBOLS 1 Melting furnace 2 Plasma torch 3 Power supply device 4 Pressure sensor 5 Voltage sensor 6 Integrating means 7 Integral comparing means 8 Voltage comparing means 9 Judging means
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｈ０５Ｂ 7/18 Ｈ０５Ｂ 7/18 Ｅ (72)考案者 鈴木 富雄 兵庫県神戸市西区高塚台１丁目５番５号 株式会社神戸製鋼所 神戸総合研究所 内 (72)考案者 田頭 成能 兵庫県神戸市西区高塚台１丁目５番５号 株式会社神戸製鋼所 神戸総合研究所 内 (72)考案者 山田 基夫 兵庫県尼崎市若王子３丁目11番20号 関 西電力株式会社 総合技術研究所内 (56)参考文献 特開 昭61−266179（ＪＰ，Ａ) 特公 昭42−14046（ＪＰ，Ｂ１) 実公 昭44−5972（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.6，ＤＢ名) H05B 7/00 - 7/22────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. 6 Identification code FI H05B 7/18 H05B 7/18 E (72) Inventor Tomio Suzuki 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Kobe Co., Ltd. Steel Works Kobe Research Institute (72) Inventor Shigeno Tabashi 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Kobe Steel Works, Ltd.Kobe Research Institute (72) Inventor Motoo Yamada Wakaoji, Amagasaki City, Hyogo Prefecture 3-11-20 Kansai Electric Power Co., Inc. Research Institute of Technology (56) References JP-A-61-266179 (JP, A) JP-B-42-14046 (JP, B1) , Y1) (58) Field surveyed (Int. Cl. 6 , DB name) H05B 7/00-7/22
Claims (3)
融炉に設けられ、水冷用のジャケットを有してプラズマ
ガスが供給されるプラズマトーチの運転監視装置であっ
て、前記炉内圧力の変動を又は前記プラズマガスの供給
圧の変動を検出する圧力センサと、該圧力センサからの
信号波形を所定周波数帯域でスペクトル積分する積分手
段と、該積分手段からの積分値を所定の積分基準値と比
較して積分基準値より大きいと異常信号を発する積分比
較手段とを備えてなるプラズマトーチの運転監視装置。An apparatus for monitoring operation of a plasma torch provided in a melting furnace as a heat source for melting a material to be melted, having a water cooling jacket, and supplied with a plasma gas, comprising: A pressure sensor for detecting a change or a change in the supply pressure of the plasma gas; an integrating means for spectrally integrating a signal waveform from the pressure sensor in a predetermined frequency band; and a predetermined integration reference value for the integrated value from the integrating means. An operation monitoring device for a plasma torch, comprising: integration comparing means for generating an abnormal signal when the integration reference value is larger than the integration reference value.
視装置であって、プラズマトーチの電源電圧の変動を検
出する電圧センサと、該電圧センサの電圧信号を所定の
電圧基準値と比較して電源の電圧降下を検出する電圧比
較手段と、該電圧比較手段からの電圧降下信号と前記積
分比較手段からの異常信号を受けた時に、プラズマトー
チの運転を停止させる信号を発する判断手段とを設けた
プラズマトーチの運転監視装置。2. A plasma torch operation monitoring device according to claim 1, wherein the voltage sensor detects a change in the power supply voltage of the plasma torch, and compares a voltage signal of the voltage sensor with a predetermined voltage reference value. Voltage comparison means for detecting a voltage drop of the power supply, and determination means for issuing a signal for stopping the operation of the plasma torch when receiving a voltage drop signal from the voltage comparison means and an abnormal signal from the integration comparison means are provided. Plasma torch operation monitoring device.
視装置であって、積分基準値が、プラズマトーチからの
ガス流量によって変化するプラズマトーチの運転監視装
置。3. The operation monitoring device for a plasma torch according to claim 1, wherein the integral reference value changes according to a gas flow rate from the plasma torch.
Priority Applications (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993031300U JP2591142Y2 (en) | 1993-05-18 | 1993-05-18 | Operation monitoring device for plasma torch |
| EP19960116254 EP0757972B1 (en) | 1993-03-08 | 1994-03-08 | Plasma furnace |
| CA 2205529 CA2205529C (en) | 1993-03-08 | 1994-03-08 | Plasma furnace and a method of operating the same |
| PCT/JP1994/000362 WO1994020791A1 (en) | 1993-03-08 | 1994-03-08 | Plasma fusion furnace and method of its operation |
| AT96116254T ATE201863T1 (en) | 1993-03-08 | 1994-03-08 | PLASMA OVEN |
| AT94908506T ATE168762T1 (en) | 1993-03-08 | 1994-03-08 | METHOD FOR OPERATING A PLASMA MELTING FURNACE |
| DK94908506T DK0645584T3 (en) | 1993-03-08 | 1994-03-08 | Process of operating a plasma oven |
| DE1994627412 DE69427412T2 (en) | 1993-03-08 | 1994-03-08 | Plasma furnace |
| DE1994611835 DE69411835T2 (en) | 1993-03-08 | 1994-03-08 | Process for operating a plasma melting furnace |
| CA 2135204 CA2135204C (en) | 1993-03-08 | 1994-03-08 | Plasma furnace and a method of operating the same |
| EP19940908506 EP0645584B1 (en) | 1993-03-08 | 1994-03-08 | Method of operating a plasma furnace |
| US08/556,022 US5579705A (en) | 1993-03-08 | 1995-11-13 | Plasma furnace and a method of operating the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993031300U JP2591142Y2 (en) | 1993-05-18 | 1993-05-18 | Operation monitoring device for plasma torch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0684699U JPH0684699U (en) | 1994-12-02 |
| JP2591142Y2 true JP2591142Y2 (en) | 1999-02-24 |
Family
ID=12327443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1993031300U Expired - Fee Related JP2591142Y2 (en) | 1993-03-08 | 1993-05-18 | Operation monitoring device for plasma torch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2591142Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393257A (en) * | 2020-11-16 | 2021-02-23 | 浙江蓝太能源工程有限公司 | Thermal plasma torch high-temperature melting furnace control method based on PLC |
-
1993
- 1993-05-18 JP JP1993031300U patent/JP2591142Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0684699U (en) | 1994-12-02 |
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